Re: [PATCH net-next] net: dsa: mt7530: support MDB and bridge flag operations

On Tue, Mar 16, 2021 at 12:36:24PM +0800, DENG Qingfang wrote:

On Tue, Mar 16, 2021 at 5:15 AM Vladimir Oltean [off-list ref] wrote:

quoted

Actually this is just how Qingfang explained it:
https://patchwork.kernel.org/project/netdevbpf/patch/20210224081018.24719-1-dqfext@gmail.com/

I just assume that MT7530/7531 switches don't need to enable flooding on
user ports when the only possible traffic source is the CPU port - the
CPU port can inject traffic into any port regardless of egress flooding
setting. If that's not true, I don't see how traffic in standalone ports
mode would work after this patch.

Correct. Don't forget the earlier version of this driver (before my
attempt to fix roaming) disabled unknown unicast flooding (trapped to
CPU) in the same way.

Ok, so in practice you don't really need to touch this register if it's
already all ones.